diff --git a/.gitignore b/.gitignore
index 533450a7c..d48035a5b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -165,3 +165,4 @@ applications/ColossalChat/logs
 applications/ColossalChat/tests/logs
 applications/ColossalChat/wandb
 applications/ColossalChat/model
+applications/ColossalChat/eval
diff --git a/applications/ColossalChat/coati/distributed/consumer.py b/applications/ColossalChat/coati/distributed/consumer.py
index 9503d65eb..620ab6ff6 100644
--- a/applications/ColossalChat/coati/distributed/consumer.py
+++ b/applications/ColossalChat/coati/distributed/consumer.py
@@ -36,6 +36,7 @@ class BaseConsumer:
         minibatch_size: int = 1,
         save_interval: int = 100,
         save_dir: str = "./model",
+        eval_interval: int = -1,
     ):
         self.num_producers = num_producers
         self.num_episodes = num_episodes
@@ -51,6 +52,7 @@ class BaseConsumer:
         self.save_dir = save_dir
         assert batch_size % minibatch_size == 0, "batch_size should be divisible by microbatch_size"
         self.num_microbatches = batch_size // minibatch_size
+        self.eval_interval = eval_interval
 
         self.model_config = model_config
         self.plugin_config = plugin_config
@@ -92,8 +94,10 @@ class BaseConsumer:
             if self.rank == 0:
                 cc.init_collective_group(self.num_producers + 1, self.num_producers, group_name="sync_model")
 
-        self.buffer = []
+        for i in range(self.num_producers):
+            cc.init_collective_group(self.world_size + 1, self.rank + 1, group_name=f"sync_eval_statistics_{i}")
 
+        self.buffer = []
         self.recv_cnt = 0
 
     def state_dict(self) -> Dict[str, torch.Tensor]:
@@ -110,6 +114,24 @@ class BaseConsumer:
             with tqdm(range(self.num_update_per_episode), desc=f"Episode {episode}", disable=self.rank != 0) as pbar:
                 for step in pbar:
                     i = 0
+                    if self.eval_interval > 0 and step % self.eval_interval == 0:
+                        eval_statistics = None
+                        for r in range(self.num_producers):
+                            print(f"[T{dist.get_rank()}] Recv eval result episode {episode} step {step} from {r}")
+                            local_eval_result = ray_broadcast_tensor_dict(
+                                None, src=0, device=self.device, group_name=f"sync_eval_statistics_{r}"
+                            )
+                            if eval_statistics is None:
+                                eval_statistics = local_eval_result
+                            else:
+                                eval_statistics = {
+                                    k: eval_statistics[k] + local_eval_result[k] for k in eval_statistics
+                                }
+                        eval_statistics = {k: (v[0] / v[1]).item() for k, v in eval_statistics.items()}
+                        if dist.get_rank() == 0:
+                            if hasattr(self, "wandb_run") and hasattr(self, "global_step"):
+                                self.wandb_run.log(eval_statistics, step=self.global_step)
+                            print(f"Eval statistics: {eval_statistics}")
                     for _ in range(self.num_recv_per_update):
                         # receive data from producers
                         for r in range(self.num_producers):
@@ -192,6 +214,7 @@ class SimpleConsumer(BaseConsumer):
         minibatch_size=1,
         save_interval: int = 100,
         save_dir="./model",
+        eval_interval: int = -1,
     ):
         super().__init__(
             num_producers,
@@ -206,6 +229,9 @@ class SimpleConsumer(BaseConsumer):
             model_config,
             plugin_config,
             minibatch_size,
+            save_interval,
+            save_dir,
+            eval_interval,
         )
         path = model_config.pop("path")
         self.model = AutoModelForCausalLM.from_pretrained(path, **model_config)
diff --git a/applications/ColossalChat/coati/distributed/grpo_consumer.py b/applications/ColossalChat/coati/distributed/grpo_consumer.py
index 877ff98ec..0336125d1 100644
--- a/applications/ColossalChat/coati/distributed/grpo_consumer.py
+++ b/applications/ColossalChat/coati/distributed/grpo_consumer.py
@@ -40,6 +40,7 @@ class GRPOConsumer(BaseConsumer):
         project_name=None,
         save_interval: int = 100,
         save_dir="./model",
+        eval_interval: int = -1,
     ):
         print(f"Using GRPO config: {grpo_config}")
         if grpo_config.get("loss_variation", "sample_level") == "token_level":
@@ -72,6 +73,7 @@ class GRPOConsumer(BaseConsumer):
             minibatch_size,
             save_interval=save_interval,
             save_dir=save_dir,
+            eval_interval=eval_interval,
         )
         path = model_config.pop("path")
         self.policy_model = AutoModelForCausalLM.from_pretrained(path, **model_config)
@@ -528,4 +530,5 @@ class GRPOConsumer(BaseConsumer):
         self.policy_model._force_wait_all_gather()
         model = self.policy_model.unwrap()
         state_dict = model.state_dict()
+        state_dict["consumer_global_step"] = torch.tensor([self.global_step], device=self.device)
         return state_dict
diff --git a/applications/ColossalChat/coati/distributed/inference_backend.py b/applications/ColossalChat/coati/distributed/inference_backend.py
index 8ff4b15bf..64dfe5cfd 100644
--- a/applications/ColossalChat/coati/distributed/inference_backend.py
+++ b/applications/ColossalChat/coati/distributed/inference_backend.py
@@ -205,7 +205,8 @@ class VLLMInferenceBackend(BaseInferenceBackend):
         generate_config = generate_config.copy()
         generate_config.update(self.FORCE_GENERATE_CONFIG)
         generate_config.update({"n": num_generations})
-        self.generate_config = SamplingParams(**generate_config)
+        self.generate_config = generate_config
+        self.sample_params = SamplingParams(**generate_config)
         self.model_config = model_config
         self.tokenizer = tokenizer
         self.num_generations = num_generations
@@ -219,8 +220,9 @@ class VLLMInferenceBackend(BaseInferenceBackend):
         micro_batch_input_ids_no_padding = [
             micro_batch_input_ids[i][first_non_padding_token_idx[i] :] for i in range(micro_batch_size)
         ]
+        sample_params = kwargs.get("sample_params", self.sample_params)
         outputs = self.llm.generate(
-            prompt_token_ids=micro_batch_input_ids_no_padding, sampling_params=self.generate_config, use_tqdm=False
+            prompt_token_ids=micro_batch_input_ids_no_padding, sampling_params=sample_params, use_tqdm=False
         )
         out_tokens = []
         out_len = []
@@ -266,11 +268,11 @@ class VLLMInferenceBackend(BaseInferenceBackend):
             "response_idx": response_idx,
         }
 
-        data = {k: v.view(micro_batch_size, self.num_generations, v.size(-1)) for k, v in data.items()}
+        data = {k: v.view(micro_batch_size, -1, v.size(-1)) for k, v in data.items()}
 
         if "gt_answer" in kwargs:
             # repeat gt_answer for each prompt.
-            data["gt_answer"] = kwargs["gt_answer"].repeat_interleave(self.num_generations, dim=1)
+            data["gt_answer"] = kwargs["gt_answer"].repeat_interleave(data["input_ids"].size(1), dim=1)
         data = {k: v.to(get_current_device()) for k, v in data.items()}
         return data
 
diff --git a/applications/ColossalChat/coati/distributed/launch.py b/applications/ColossalChat/coati/distributed/launch.py
index a346d1d4f..d1b6158e5 100644
--- a/applications/ColossalChat/coati/distributed/launch.py
+++ b/applications/ColossalChat/coati/distributed/launch.py
@@ -34,7 +34,7 @@ def launch_distributed(
     inference_microbatch_size: int,
     train_batch_size: int,
     train_minibatch_size: int,
-    dataset_config: Dict[str, Any],
+    train_dataset_config: Dict[str, Any],
     dataloaders_config: Dict[str, Any],
     inference_model_config: Dict[str, Any],
     generate_config: Dict[str, Any],
@@ -50,6 +50,9 @@ def launch_distributed(
     project_name: Optional[str] = None,
     save_interval: int = 100,
     save_dir: str = "./model",
+    eval_dataset_config: Optional[Dict[str, Any]] = None,
+    eval_interval: int = 100,
+    eval_save_dir: Optional[str] = None,
 ):
 
     if core_algo not in ALGO_MAP:
@@ -60,9 +63,9 @@ def launch_distributed(
     train_dp_size = get_dp_size_fast(num_consumer_procs, plugin_config)
     assert (inference_batch_size * num_producers) % (train_batch_size * train_dp_size) == 0
 
-    dataset_path = dataset_config["path"]
+    dataset_path = train_dataset_config["path"]
     num_samples = get_jsonl_size_fast(dataset_path)
-    global_inference_batch_size = inference_batch_size * num_producers
+    global_inference_batch_size = inference_batch_size * num_producers  # TODO: this doesn't support TP on producer
     num_update_per_episode = num_samples // global_inference_batch_size
     num_recv_per_update = inference_batch_size // inference_microbatch_size
 
@@ -74,7 +77,7 @@ def launch_distributed(
             num_consumer_procs=num_consumer_procs,
             num_episodes=num_episodes,
             batch_size=inference_batch_size,
-            dataset_config=dataset_config,
+            train_dataset_config=train_dataset_config,
             dataloaders_config=dataloaders_config,
             model_config=inference_model_config,
             generate_config=generate_config,
@@ -83,6 +86,10 @@ def launch_distributed(
             backend=inference_backend,
             num_generations=num_generations,
             consumer_plugin_config=plugin_config,
+            eval_dataset_config=eval_dataset_config,
+            eval_interval=eval_interval,
+            evaluation_function_type=grpo_config["reward_fn_type"],
+            eval_save_dir=eval_save_dir,
         )
         procs.append(producer)
     generate_config_consumer = copy.deepcopy(generate_config)
@@ -111,6 +118,7 @@ def launch_distributed(
             project_name=project_name,
             save_interval=save_interval,
             save_dir=save_dir,
+            eval_interval=eval_interval,
         )
         procs.append(consumer)
     ray.get([p.setup.remote() for p in procs])
diff --git a/applications/ColossalChat/coati/distributed/producer.py b/applications/ColossalChat/coati/distributed/producer.py
index ffe3a4428..483ad74b3 100644
--- a/applications/ColossalChat/coati/distributed/producer.py
+++ b/applications/ColossalChat/coati/distributed/producer.py
@@ -1,9 +1,13 @@
+import copy
+import os
 from typing import Any, Dict, Optional
 
 import ray
 import ray.util.collective as cc
 import torch
+import tqdm
 from coati.dataset.loader import RawConversationDataset
+from coati.distributed.reward.reward_fn import boxed_math_reward_fn, math_reward_fn
 from torch.utils.data import DataLoader, DistributedSampler
 from transformers import AutoTokenizer
 
@@ -11,7 +15,12 @@ from colossalai.utils import get_current_device
 
 from .comm import ray_broadcast_tensor_dict
 from .inference_backend import BACKEND_MAP
-from .utils import pre_send
+from .utils import pre_send, safe_write_jsonl
+
+try:
+    from vllm import SamplingParams
+except ImportError:
+    LLM = None
 
 
 class BaseProducer:
@@ -22,7 +31,7 @@ class BaseProducer:
         num_consumer_procs: int,
         num_episodes: int,
         batch_size: int,
-        dataset_config: Dict[str, Any],
+        train_dataset_config: Dict[str, Any],
         dataloaders_config: Dict[str, Any],
         model_config: Dict[str, Any],
         generate_config: Dict[str, Any],
@@ -30,6 +39,10 @@ class BaseProducer:
         microbatch_size: int = 1,
         backend: str = "transformers",
         consumer_plugin_config: Dict[str, Any] = None,
+        eval_dataset_config=None,
+        eval_interval=-1,  # disable evaluation
+        evaluation_function_type="think_answer_tags",
+        eval_save_dir: str = "./eval",
     ):
         self.producer_idx = producer_idx
         self.num_producers = num_producers
@@ -40,10 +53,17 @@ class BaseProducer:
         assert batch_size % microbatch_size == 0
         self.num_microbatches = batch_size // microbatch_size
 
-        self.dataset_config = dataset_config
+        self.train_dataset_config = train_dataset_config
         self.model_config = model_config
         self.generate_config = generate_config
         self.tokenizer_config = tokenizer_config
+        self.consumer_plugin_config = consumer_plugin_config
+        self.eval_interval = eval_interval
+        self.eval_save_dir = eval_save_dir
+        self.consumer_global_step = 0
+
+        if os.path.exists(self.eval_save_dir):
+            raise ValueError(f"Eval save dir {self.eval_save_dir} already exists. Please delete it or change the name.")
 
         # init tokenizer
         if tokenizer_config is None:
@@ -55,13 +75,13 @@ class BaseProducer:
         self.tokenizer.padding_side = "left"
 
         # init dataloader
-        dataset_path = dataset_config.pop("path")
-        self.dataset = RawConversationDataset(self.tokenizer, dataset_path, **dataset_config)
-        self.dataloader = DataLoader(
-            self.dataset,
+        train_dataset_path = train_dataset_config.pop("path")
+        self.train_dataset = RawConversationDataset(self.tokenizer, train_dataset_path, **train_dataset_config)
+        self.train_dataloader = DataLoader(
+            self.train_dataset,
             batch_size=microbatch_size,
             sampler=DistributedSampler(
-                self.dataset,
+                self.train_dataset,
                 num_replicas=num_producers,
                 rank=producer_idx,
                 shuffle=True,
@@ -71,6 +91,36 @@ class BaseProducer:
             num_workers=4,
             drop_last=True,
         )
+
+        self.eval_dataset_config = eval_dataset_config
+        if self.eval_dataset_config is not None:
+            self.eval_dataloaders = {}
+            for eval_task_name in self.eval_dataset_config:
+                eval_dataset_path = eval_dataset_config[eval_task_name].pop("path")
+                eval_dataset = RawConversationDataset(
+                    self.tokenizer, eval_dataset_path, **eval_dataset_config[eval_task_name]
+                )
+                print(f"[P{self.producer_idx}] eval dataset {eval_task_name} size: {len(eval_dataset)}")
+                self.eval_dataloaders[eval_task_name] = DataLoader(
+                    eval_dataset,
+                    batch_size=microbatch_size,
+                    sampler=DistributedSampler(
+                        eval_dataset,
+                        num_replicas=num_producers,
+                        rank=producer_idx,
+                        shuffle=False,
+                        drop_last=False,
+                        seed=42,
+                    ),
+                )
+            if evaluation_function_type == "think_answer_tags":
+                self.evaluation_function = math_reward_fn
+            elif evaluation_function_type == "boxed":
+                self.evaluation_function = boxed_math_reward_fn
+            else:
+                raise ValueError(f"Unknown evaluation function type {evaluation_function_type}")
+        else:
+            raise ValueError("eval_dataset_config is not defined")
         self.device = get_current_device()
 
         # init backend
@@ -88,6 +138,7 @@ class BaseProducer:
                 cc.init_collective_group(self.num_producers + 1, self.producer_idx, group_name=f"sync_model_{i}")
         else:
             cc.init_collective_group(self.num_producers + 1, self.producer_idx, group_name="sync_model")
+        cc.init_collective_group(1 + self.num_consumer_procs, 0, group_name=f"sync_eval_statistics_{self.producer_idx}")
 
     def rollout(self, input_ids: torch.Tensor, attention_mask: torch.Tensor, **kwargs) -> Dict[str, torch.Tensor]:
         raise NotImplementedError
@@ -96,29 +147,64 @@ class BaseProducer:
         raise NotImplementedError
 
     def loop(self) -> None:
-        num_update_per_episode = len(self.dataloader) // self.num_microbatches
+        num_update_per_episode = len(self.train_dataloader) // self.num_microbatches
         num_valid_microbatches = num_update_per_episode * self.num_microbatches
 
         print(
-            f"[P{self.producer_idx}] num_valid_microbatches {num_valid_microbatches}, nmb: {self.num_microbatches}, dl: {len(self.dataloader)}"
+            f"[P{self.producer_idx}] num_valid_microbatches {num_valid_microbatches}, nmb: {self.num_microbatches}, dl: {len(self.train_dataloader)}"
         )
         for episode in range(self.num_episodes):
-            self.dataloader.sampler.set_epoch(episode)
-            for i, batch in enumerate(self.dataloader):
+            self.train_dataloader.sampler.set_epoch(episode)
+            for i, batch in enumerate(self.train_dataloader):
                 if i >= num_valid_microbatches:
                     break
+                if self.eval_interval > 0 and self.eval_dataset_config is not None:
+                    if i % self.eval_interval == 0:
+                        eval_statistics = {}
+                        for eval_task_name in self.eval_dataloaders:
+                            print(
+                                f"[P{self.producer_idx}] Evaluate episode {episode} step {i} on task {eval_task_name}"
+                            )
+                            eval_results = []
+                            eval_statistics[eval_task_name] = torch.zeros(2, device=self.device)
+                            for eval_batch in tqdm.tqdm(
+                                self.eval_dataloaders[eval_task_name], disable=self.producer_idx != 0
+                            ):
+                                eval_outputs = self.rollout(**eval_batch, sample_params=self.eval_sample_params)
+                                eval_results = eval_results + [
+                                    self.evaluation_function(
+                                        eval_outputs["input_ids"][m][n],
+                                        eval_outputs["gt_answer"][m][n],
+                                        eval_outputs["response_idx"][m][n],
+                                        tokenizer=self.tokenizer,
+                                        eval_mode=True,
+                                    )
+                                    for m in range(eval_outputs["input_ids"].size(0))
+                                    for n in range(eval_outputs["input_ids"].size(1))
+                                ]
+                            eval_statistics[eval_task_name][0] += len(
+                                [res for res in eval_results if res["ans_valid"] == 1]
+                            )
+                            eval_statistics[eval_task_name][1] += len(eval_results)
+                            # save eval results
+                            result_file_name = os.path.join(
+                                self.eval_save_dir,
+                                f"{eval_task_name}_episode_{episode}_step_{self.consumer_global_step}.jsonl",
+                            )
+                            # delete the file if it exists
+                            safe_write_jsonl(result_file_name, eval_results)
+                        print(f"[P{self.producer_idx}] Send eval statistics episode {episode} step {i}")
+                        ray_broadcast_tensor_dict(
+                            eval_statistics,
+                            src=0,
+                            device=self.device,
+                            group_name=f"sync_eval_statistics_{self.producer_idx}",
+                        )
                 outputs = self.rollout(**batch)
 
                 print(f"[P{self.producer_idx}] Send data {[(k, v.shape) for k, v in outputs.items()]}")
                 outputs["temperature"] = torch.tensor(
-                    [
-                        (
-                            self.model.generate_config["temperature"]
-                            if isinstance(self.model.generate_config.temperature, dict)
-                            else self.model.generate_config.temperature
-                        )
-                    ]
-                    * outputs["input_ids"].size(0)
+                    [self.model.generate_config["temperature"]] * outputs["input_ids"].size(0)
                 ).to(outputs["input_ids"].device)
                 outputs = pre_send(outputs)
                 ray_broadcast_tensor_dict(
@@ -150,6 +236,8 @@ class BaseProducer:
                         state_dict = ray_broadcast_tensor_dict(
                             None, self.num_producers, device=self.device, group_name="sync_model"
                         )
+                        if "consumer_global_step" in state_dict:
+                            self.consumer_global_step = state_dict.pop("consumer_global_step").item()
                         self.load_state_dict(state_dict)
                     del state_dict
                     torch.cuda.empty_cache()
@@ -159,7 +247,7 @@ class BaseProducer:
                         self.model.llm.wake_up()
                 # linear annealing for 1 episode, temperature from initial to 0.9
                 if episode <= 0:
-                    ratio = 1 - (len(self.dataloader) - i) / len(self.dataloader)
+                    ratio = 1 - (len(self.train_dataloader) - i) / len(self.train_dataloader)
                     if isinstance(self.model.generate_config.temperature, dict):
                         self.model.generate_config["temperature"] = (1 - ratio) * self.generate_config[
                             "temperature"
@@ -179,7 +267,7 @@ class SimpleProducer(BaseProducer):
         num_consumer_procs,
         num_episodes,
         batch_size,
-        dataset_config,
+        train_dataset_config,
         dataloaders_config,
         model_config,
         generate_config,
@@ -188,6 +276,10 @@ class SimpleProducer(BaseProducer):
         backend="transformers",
         num_generations: int = 8,
         consumer_plugin_config=None,
+        eval_dataset_config=None,
+        eval_interval=-1,  # disable evaluation
+        evaluation_function_type="think_answer_tags",
+        eval_save_dir: str = "./eval",
     ):
         super().__init__(
             producer_idx,
@@ -195,7 +287,7 @@ class SimpleProducer(BaseProducer):
             num_consumer_procs,
             num_episodes,
             batch_size,
-            dataset_config,
+            train_dataset_config,
             dataloaders_config,
             model_config,
             generate_config,
@@ -203,14 +295,21 @@ class SimpleProducer(BaseProducer):
             microbatch_size,
             backend,
             consumer_plugin_config,
+            eval_dataset_config=eval_dataset_config,
+            eval_interval=eval_interval,
+            evaluation_function_type=evaluation_function_type,
+            eval_save_dir=eval_save_dir,
         )
         self.model = self.backend_cls(model_config, generate_config, self.tokenizer, num_generations)
+        self.eval_generation_config = copy.deepcopy(self.model.generate_config)
+        self.eval_generation_config["n"] = 1  # use 1 generation for evaluation
+        self.eval_sample_params = SamplingParams(**self.eval_generation_config)
 
     @torch.no_grad()
     def rollout(self, input_ids, attention_mask, **kwargs):
         rollouts = self.model.generate(input_ids, attention_mask, **kwargs)
-        if self.producer_idx == 1:
-            print("Rollout example:\n", self.tokenizer.decode(rollouts["input_ids"][0][0], skip_special_tokens=True))
+        # if self.producer_idx == 1:
+        #     print("Rollout example:\n", self.tokenizer.decode(rollouts["input_ids"][0][0], skip_special_tokens=True))
 
         return rollouts
 
diff --git a/applications/ColossalChat/coati/distributed/reward/reward_fn.py b/applications/ColossalChat/coati/distributed/reward/reward_fn.py
index b68c1a92f..14d340dc4 100644
--- a/applications/ColossalChat/coati/distributed/reward/reward_fn.py
+++ b/applications/ColossalChat/coati/distributed/reward/reward_fn.py
@@ -5,6 +5,7 @@ from .reward_utils import extract_boxed_solution, extract_solution, validate_res
 
 def math_reward_fn(input_ids, gt_answer, response_idx, **kwargs):
     tokenizer = kwargs["tokenizer"]
+    eval_mode = kwargs.get("eval_mode", False)
     soft_over_length_punishment = kwargs.get("soft_over_length_punishment", False)
     acc_score = 10.0
     reward = torch.tensor(0.0)
@@ -44,36 +45,23 @@ def math_reward_fn(input_ids, gt_answer, response_idx, **kwargs):
 
     reward = reward + length_reward
 
-    return torch.tensor([reward, format_acc, ans_acc]).to(input_ids.device)
-
-
-def gsm8k_reward_fn(input_ids, **kwargs):
-    gt_answer = kwargs["gt_answer"]
-    tokenizer = kwargs["tokenizer"]
-    s, e = kwargs["response_start"], kwargs["response_end"]
-    reward = torch.tensor(0.0).to(input_ids.device)
-    if gt_answer is None:
-        return reward
-    decoded_final_answer = tokenizer.decode(input_ids[s : e + 1], skip_special_tokens=True)
-    final_answer, processed_str = extract_solution(decoded_final_answer)
-    is_valid = True
-    try:
-        int(final_answer.strip())
-    except Exception:
-        is_valid = False
-
-    format_valid = validate_response_structure(processed_str, kwargs["tags"])
-    if not is_valid or not format_valid:
-        return reward
+    if not eval_mode:
+        return torch.tensor([reward, format_acc, ans_acc]).to(input_ids.device)
     else:
-        reward += 1.0
-        if gt_answer.strip().replace(" ", "").lower() == final_answer.strip().replace(" ", "").lower():
-            reward = reward + 9.0
-        return reward
+        prompt = tokenizer.decode(input_ids[:s], skip_special_tokens=True)
+        return {
+            "prompt": prompt,
+            "prediction": decoded_final_answer,
+            "gold": gt_answer,
+            "parsed": final_answer,
+            "format_valid": format_acc.item(),
+            "ans_valid": ans_acc.item(),
+        }
 
 
 def boxed_math_reward_fn(input_ids, gt_answer, response_idx, **kwargs):
     tokenizer = kwargs["tokenizer"]
+    eval_mode = kwargs.get("eval_mode", False)
     soft_over_length_punishment = kwargs.get("soft_over_length_punishment", False)
     format_score = 0.0
     acc_score = 10.0
@@ -91,7 +79,7 @@ def boxed_math_reward_fn(input_ids, gt_answer, response_idx, **kwargs):
             length_reward = ((max_length - cache_length) - res_length) / cache_length * acc_score
 
     if gt_answer is None:
-        return reward
+        return torch.tensor([reward, format_acc, ans_acc]).to(input_ids.device)
 
     decoded_final_answer = tokenizer.decode(input_ids[s : e + 1], skip_special_tokens=True)
     gt_answer = tokenizer.decode(gt_answer.squeeze(0), skip_special_tokens=True)
@@ -108,5 +96,15 @@ def boxed_math_reward_fn(input_ids, gt_answer, response_idx, **kwargs):
         reward += acc_score
 
     reward = reward + length_reward
-
-    return torch.tensor([reward, format_acc, ans_acc]).to(input_ids.device)
+    if not eval_mode:
+        return torch.tensor([reward, format_acc, ans_acc]).to(input_ids.device)
+    else:
+        prompt = tokenizer.decode(input_ids[:s], skip_special_tokens=True)
+        return {
+            "prompt": prompt,
+            "prediction": decoded_final_answer,
+            "gold": gt_answer,
+            "parsed": final_answer,
+            "format_valid": format_acc.item(),
+            "ans_valid": ans_acc.item(),
+        }
diff --git a/applications/ColossalChat/coati/distributed/utils.py b/applications/ColossalChat/coati/distributed/utils.py
index 5f7879669..fb2a0dfd3 100644
--- a/applications/ColossalChat/coati/distributed/utils.py
+++ b/applications/ColossalChat/coati/distributed/utils.py
@@ -1,6 +1,9 @@
+import json
+import os
 from typing import Any, Dict, List
 
 import torch
+from filelock import FileLock
 
 from colossalai.shardformer.layer.loss import dist_log_prob
 
@@ -130,3 +133,13 @@ def masked_sum(tensor: torch.Tensor, mask: torch.Tensor, dim: int = 1) -> torch.
     """
     tensor = tensor * mask
     return tensor.sum(dim=dim)
+
+
+def safe_write_jsonl(file_path, data):
+    with FileLock(file_path + ".lock"):
+        # Ensure file exists
+        os.makedirs(os.path.dirname(file_path), exist_ok=True)
+        with open(file_path, "a", encoding="utf8") as f:
+            for entry in data:
+                json_line = json.dumps(entry, ensure_ascii=False)
+                f.write(json_line + "\n")
diff --git a/applications/ColossalChat/rl_example.py b/applications/ColossalChat/rl_example.py
index 788e60c2e..b2fafd42e 100644
--- a/applications/ColossalChat/rl_example.py
+++ b/applications/ColossalChat/rl_example.py
@@ -1,4 +1,5 @@
 import argparse
+import json
 import os
 
 import ray
@@ -8,7 +9,16 @@ from coati.distributed.launch import launch_distributed
 if __name__ == "__main__":
     parser = argparse.ArgumentParser()
     parser.add_argument("-m", "--model", type=str, default="Qwen/Qwen2.5-7B")
-    parser.add_argument("-d", "--dataset", type=str, default="data.jsonl")
+    parser.add_argument("-d", "--dataset", type=str, default="data_train.jsonl")
+    parser.add_argument(
+        "-ed",
+        "--eval-dataset",
+        type=str,
+        default='{"eval task name":"data_eval.jsonl"}',
+        help="Evaluation dataset for each task, please use json format to specify the dataset for each task. \
+        For example: {'task1':'data_eval_task1.jsonl', 'task2':'data_eval_task2.jsonl'}, the jsonl file should be in the same format as the training dataset. \
+        The key is the task name, and the value is the path to the jsonl file",
+    )
     parser.add_argument("-p", "--project", type=str, default="GRPO", help="Project name.")
     parser.add_argument("-e", "--num-episodes", type=int, default=1, help="Number of episodes to train.")
 
@@ -94,11 +104,14 @@ if __name__ == "__main__":
         choices=["think_answer_tags", "boxed"],
         help="Reward type for GRPO.",
     )
+    parser.add_argument("-ei", "--eval-interval", type=int, default=100, help="Interval for evaluation.")
 
     # Logging/Checkpointing parameters
     parser.add_argument("-si", "--save-interval", type=int, default=100, help="Interval for saving checkpoints.")
     parser.add_argument("-sd", "--save-dir", type=str, default="./model", help="Directory for saving checkpoints.")
-
+    parser.add_argument(
+        "-esd", "--eval-save-dir", type=str, default="./eval", help="Directory for saving evaluation results."
+    )
     args = parser.parse_args()
 
     if args.train_minibatch_size is None:
@@ -208,7 +221,7 @@ if __name__ == "__main__":
         inference_microbatch_size=args.inference_microbatch_size,
         train_batch_size=args.train_batch_size,
         train_minibatch_size=args.train_minibatch_size,
-        dataset_config={
+        train_dataset_config={
             "path": args.dataset,
             "max_length": args.max_prompt_tokens,
             "system_prompt": args.system_prompt,
@@ -238,4 +251,10 @@ if __name__ == "__main__":
         project_name=args.project,
         save_interval=args.save_interval,
         save_dir=os.path.join(args.save_dir, args.project.replace(" ", "_")),
+        eval_dataset_config={
+            k: {"path": v, "max_length": args.max_prompt_tokens, "system_prompt": args.system_prompt}
+            for k, v in json.loads(args.eval_dataset).items()
+        },
+        eval_interval=args.eval_interval,
+        eval_save_dir=os.path.join(args.eval_save_dir, args.project.replace(" ", "_")),
     )